3-android-activities

12 Pages·2016·0.96 MB·Indonesian

BAB 2
Android Activities
Mahardeka Tri Ananta
[email protected]
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Outline
• Activity Lifecycle Overview
• Implementation of Activity Lifecycle Methods
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Android Application Lifecycle
• In an ideal case all Android applications started by the user remain in
memory, that makes restarting applications faster.
• But in reality the available memory on an Android device is limited.
• To manage these limited resources the Android system is allowed to
terminate running processes or recycling Android components.
Courtesy: http://www.vogella.com/tutorials/AndroidLifeCycle/article.html
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Android Application Lifecycle
Courtesy:
1. http://www.vogella.com/tutorials/AndroidLifeCycle/article.html
2. Android Studio Development Essentials - Android 6 Edition page 108
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Android Application Fundamentals
An android application consists of one or more components that are
defined in the android manifest.xml file. Here are the four types of
app components:
1. An Activity
2. A Service
3. A Broadcast Receiver
4. A Content Provider
Courtesy : https://developer.android.com/guide/components/fundamentals.html
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What is Android Activity?
• A “single screen” with a user interface that’s visible to user
• An activity is a single, standalone module (subclass of
ContextThemeWrapper Class) of application functionality that
usually correlates directly to a single user interface screen and its
corresponding functionality.
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The Activity Stack
• Managing activities in the system
Courtesy: Delwar Hossain, Dept of CSE Daffodil International Univ.
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The Activity State
States Description
Active / Running The activity is at the top of the Activity Stack. Foreground task visible on the
device screen
Paused Activity is still visible but partially obscured, instance is running but might be
killed by the system.
Stopped The activity is currently not visible to the user (in other words it is totally
obscured on the device display by other activities).
Killed The Activity has been terminated by the runtime system in order to free up
memory and is no longer present on the Activity Stack
Courtesy: Android Studio Development Essentials - Android 6 Edition page 110
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The Activity Lifecycle
courtesy: https://developer.android.com/reference/android/app/Activity.html
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